Method for producing slab for ferritic stainless cold rolled steel sheet and method for manufacturing ferritic stainless cold rolled steel sheet

摘要

PROBLEM TO BE SOLVED: To provide a ferritic stainless cold rolled steel sheet excellent in surface quality and a manufacturing method therefor.SOLUTION: It contains C: 0.002 to 0.020%, N: 0.001 to 0.020%, Si: 0.01 to 2.00%, Mn: 0.01 to 1.00%, P: 0.04% or less, S: 0.02% or less, Al: 0.01 to 0.40%, Cr: 11.5% to 25.0%, Ni: 0.01 to 1.00%, Ti: 0.01 to 0.45% and the balance Fe with inevitable impurities. It is manufactured from a slab after continuous casting with maximum cross section area of a TiN cluster present in a zone in 10 mm from a surface of less than 625 m. A molten steel temperature during casting is set at T(°C)=1559-1.55×Cr% or more or T(°C))=1559-1.55×Cr%+(Ti%×N%-3.5×10)×(3486×Si%+5632) or more by a Ti%×N% value.